CEFCharp下载问题

CEFCharp提供了下载接口，但是可能有些版本并未实现，导致不能进行下载，所以需要对下载接口进行实现，代码如下

/// <summary>
    /// 继承CEF文件下载接口，并实现 jhd_006 2018-5-24 15:06:20
    /// </summary>
    public class DownloadHandler : IDownloadHandler
    {
        public void OnBeforeDownload(IBrowser browser, DownloadItem downloadItem, IBeforeDownloadCallback callback)
        {
            if (!callback.IsDisposed)
            {
                using (callback)
                {
                    callback.Continue(downloadItem.SuggestedFileName, showDialog: true);
                }
            }
        }

        public void OnDownloadUpdated(IBrowser browser, DownloadItem downloadItem, IDownloadItemCallback callback)
        {

        }
    }